Constructional material



A Patented July s, 1930 UNITED STATES PATENT OFFICE ALBERT C. FISCHER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE PHILIP CAREY MANU- FACTURING COMPANY, A. CORPORATION OF OHIO CONSTRUCTIONAL MATERIAL Application filed. December 12, 1925. Serial No. 75,152.

This invention relates to expansion joints surfaced with a rubber film in order to make same waterproofand air tight, .actlng as a packaging sealing means, preserving the body of the joint and preventing adhesion to other strips when crated. By expansion joints are meant premoulded expansion strips, as known to the art.

Absorption tests are made by highway oiiiciails in order to judge the value of expansion 'oints, and inasmuch as light and air aiect ituminous materials it is a desirable feature to coat the expansion joint surface with a material which will prevent access of air or light to the bituminous material.

The preformed expansion joints may be 'made up in an suita le way, as is known to the art, and t ey are usually prepared in strips 1/1 inch to 2 inches in thickness, and in any length up to 12 or 15 feet, and in width equal to the de th of the'pavement or struc' ture in which t ey are to be used.

A In order to better describe my invention,

" I have illustrated, in the accompanying drawy ings, a form of pre-molded expansion embodying my invention.

Referring to the drawings:

The single figure shows a cross section tak-- en through a strip of material embodying my invention.

The expansion joint of my invention comprises a. core, a, which may be formed of a suitable fibrous materia-l and which may, if desired, be impregnated with bituminous material. The core is enclosed with a sheath, b, of rubber, which may be applied to the core in any convenient manner, as by s raying or dipping the core into a solution o rubber or uncoagulated latex and thereafter allowing` the lm of rubber or latex to dry. Thereafter the rubber film may be vulcanized or not as desired. This process results in the' formation of a rubber sheath partially entering and interlocking at its inner surface with the out er surface of the core .to form a secure connection between the core and the sheath whereby the latter'may not easily be detafched from the core.

In preventing ingress of light and air into the outside pores of the expansion joint the life of the material will be preserved.

' Likewise expansion joints-are formed out of fibrous materials matted, and my purpose would be to surface saturate or coat such brous matted sheets with the same rubber can be accomplished with any suitable rigging for paint sprayers, which are known to the market. The moisture will evaporate, leaving a rubber film upon the surface and lilling the pores of the librous matted mate-4 70 rial, or the expansion oint, as described.

l It is readily understood that where the f1- brous material is not saturated with bituminous material the statement relative to air and light would not apply, but it would make the fibrous matted material waterproof.

Uncoagulated latex, as described, can read- 1ly be purchased on the market, and is shipped in this state.

Likewise the surface of the core, a, may first be treated with a film of sulphur dust, should it be desirable to vulcanize the rubber surface film or sheathA b, the sulphur dust is a vulcanizing agent and may, if desired, be mixed directly with latex before the latter is sprayed or otherwise applied to the core, and any other suitable vulcanizing agent may be used, which would impart some of its properties to the latex when placed upon the surface, and by heating the same a vulcanized film of rubber will be produced.

.to the surface of the sheets by spraying. This I material having is to prepare an expansion joint with a bituminous material, the sides of which are produced without dusting` material or interfering surfaces, and placing directly over this bituminous surface of the expansion joint a lm of uncoagulated latex, thus closing all the pores and shutting out the light an air.

Xpansion joints are often prepared in a heated state, and where thisis done the evaporation of course, will be faster than Where this does not occur.

tageous in preventing adhesion of the strips in shutting out the. air and light, and in closing the pores, thus making the absorption properties of the joint practically zero.

Fibrous matted materials may be procured on the market in various shapes and forms, and insulating materials which 'are matted may be employed for this purpose when utilized for expansion joints, but it hasalways been found more practical nous mixtures-with fibrous matter, because of the better resistance to strains and pressures.

The material produced by this treatment is aterproof, light and air proof and the surface may be coated with a dusting material if preferred, in which case the dusting material would either be a plied first to the surfaceof the stri s and t en coated with latex, 6r. the materia would be coated with latex rst and then have dusting material placed thereover. This would not be necessary in the case of fibrous matted material utilized for the purpose of ex ansion joints. This brous matted materiaiJm iy be a dried vegetable fibre, matted substance compressed, or any one of the numerous insulation materials which arefound on the market, which will subject themselves to this treatment.

As it is not new to manufacture premoulded erpansion joints, I am leaving to the art, as dlsclosed in the United States Patent Ofiice over a lonlg period of years, the various structures, as believe there is invention and utility in a light, air and moisture proof film coating of latex.

I claim: i

1. An expansion joint comprising apreformed compressible strip having the sides thereof surfaced with rubber.

2. An expansion joint comprising a preformed strip of waterproof fibrous material having the sides thereof surfaced with rubber The latex film will be particularly advan- An expansion joint comprising a `preformedstrip of matted waterproof fibrous the sides thereof surfaced with rubber.

4. An expansion joint comprising a preto utilize bitumi-v invase? formed com ressible body having the outer sides thereo surfaced with rubber.

' 5. An expansion joint comprising a preformed core of matted fibrous material having an outer sheath of rubber.

6. Constructional material comprising aA 

